Chrysler Full-Size Trucks 1967-1988 Repair Guide

Manual Transmission

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FLUID RECOMMENDATIONS



New Process A-230, A-250, A-390, A-745, and 2500:


ATF+3 ATFNew Process NP-420:
 
Below 32°F-SAE 30 engine oil
 
32-100°F-SAE 50 engine oil or SAE 90 gear oil
 
100+°F-SAE 140 gear oilNew Process NP-435:
 
Below 32°F-SAE 30 engine oil
 
32-100°F-SAE 50 engine oil or SAE 90 gear oil
 
100+°F- SAE 140 gear oilNew Process NP-445:
 
Below 32°F-SAE 30 engine oil
 
32-100°F-SAE 50 engine oil or SAE 90 gear oil
 
100+°F-SAE 140 gear oilNew Process NP-2500:
 
SAE 10W-30 engine oilBorg-Warner T-87E:
 
Below 32°F-SAE 30 engine oil
 
32-100°F-SAE 50 engine oil or SAE 90 gear oil
 
100+°F-SAE 140 gear oilA-833 Overdrive-4
 
ATF+3
 

If gear noise or rattle is experienced with the A-230/A-250/A-390/A-833, SAE 90 gear oil may be used in place of the ATF.

LEVEL CHECK



See Figure 1

The fluid level should be checked every 6 months/6,000 miles (9500 km), whichever comes first.



Click image to see an enlarged view

Fig. Fig. 1: Manual NP-2500 case details

  1. Park the truck on a level surface, turn the engine OFF , apply the parking brake and block the wheels.
  2.  
  3. Remove the filler plug from the side of the transmission case with a proper size wrench. The fluid level should be even with the bottom of the filler hole.
  4.  
  5. If additional fluid is necessary, add it through the filler hole using a siphon pump or squeeze bottle.
  6.  
  7. Install the filler plug; do not overtighten.
  8.  

DRAIN AND REFILL



  1. Position the truck on a level surface.
  2.  
  3. Place a pan of sufficient capacity under the transmission and remove the upper (fill) plug to provide a vent opening.
  4.  
  5. Remove the lower (drain) plug and allow all of the fluid to drain from the transmission. On the A-390 top-cover three speed, remove the lower extension-to-case mounting bolt to drain the transmission.
  6.  
  7. Reinstall the drain plug.
  8.  
  9. Pump in sufficient lubricant to bring the level to the bottom of the filler plug opening.
  10.  

 
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